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A038239 Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*9^j. 0
1, 4, 9, 16, 72, 81, 64, 432, 972, 729, 256, 2304, 7776, 11664, 6561, 1024, 11520, 51840, 116640, 131220, 59049, 4096, 55296, 311040, 933120, 1574640, 1417176, 531441, 16384, 258048, 1741824, 6531840, 14696640, 19840464, 14880348 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.

LINKS

Table of n, a(n) for n=0..34.

CROSSREFS

Sequence in context: A030075 A296111 A038784 * A263094 A226354 A299921

Adjacent sequences:  A038236 A038237 A038238 * A038240 A038241 A038242

KEYWORD

nonn,tabl,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified June 16 05:18 EDT 2019. Contains 324145 sequences. (Running on oeis4.)